- ISSN 0010-0765 printed
- ISSN 1212-6950 electronic
1956, Volume 21
- Issue 6 contents (June, pp. 1363-1660)
- Issue 5 contents (May, pp. 1083-1362)
- Issue 4 contents (April, pp. 795-1081)
- Issue 3 contents (March, pp. 517-793)
- Issue 2 contents (February, pp. 269-508)
- Issue 1 contents (January, pp. 1-268)
